Lincoln Electric SVM118-A service manual Power Board Voltage Test Chart, LED 2 on

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F-27 F-27

TROUBLESHOOTING & REPAIR

POWER BOARD VOLTAGE TEST CHART

Check Points	Signals Being	Expected	Special Conditions
	Checked	Reading	for Test
IJ4 to 2J4	AC supply voltage	10VAC	None
	from T5 transformer
4J4 to 6J4	AC supply voltage	32VAC	None
	from T5 transformer
4J4 to 5J4	AC supply voltage	16VAC	None
	from T5 transformer
10J4 to 12J4	AC supply voltage	36VAC	None
	from T5 transformer
3J2(+) to 5J2	Regulated +15VDC	+15VDC	LED 1 ON
4J2(-) to 5J2	Regulated -15VDC	-15VDC	LED 2 ON
IJ2(+) to 2J2	Unregulated DC	+14VDC	None

Note: LED 3 should be ON when gate signal is applied to SCR 1.

LED 4 should be ONE when gate signal is applied to SCR 4.

SQUARE WAVE TIG 355